For driver, you'll need to use a third-party CUPS driver, like the Gimp-Print drivers included in OS X. If the 750 isn't in that, update to the new version of Gimp-Print, now called Gutenprint:
http://gimp-print.sourceforge.net/MacOSX.php3
To setup for the print server, you can get the print server's IP address and queue name from a PC that's setup (go to printer properties > ports tab and click configure port to see the details).
Read the print server docs carefully to figure out which protocol(s) is supported. The IPP and LPD protocols both require a device-specific queue name (also called port name), which should be in the manual. Common queue names are L1, lp, P1 etc. HP Jetdirect doesn't use queue name. HP Jetdirect equals raw port 9100 printing in PC-oriented manuals.
